The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A141428 Conjectured to be complete list of numbers not of the form x^2 + 5*y^2 + 3*triangular number. 8
 2, 11, 26, 37, 40, 53, 62, 142, 220, 425, 692 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..11. Ben Kane and Zhi-Wei Sun, On almost universal mixed sums of squares and triangular numbers, arXiv:0808.2761 MATHEMATICA Reap[For[n = 1, n <= 700, n++, If[FindInstance[n == x^2 + 5y^2 + 3z(z+1)/2, {x, y, z}, Integers] == {}, Print[n]; Sow[n]]]][[2, 1]] (* Jean-François Alcover, Oct 01 2018 *) CROSSREFS Cf. A141273, A141386, A141423, A141443, A141463. Cf. A141464, A141491, A141497. Sequence in context: A241238 A296285 A077482 * A371344 A104085 A080663 Adjacent sequences: A141425 A141426 A141427 * A141429 A141430 A141431 KEYWORD nonn AUTHOR N. J. A. Sloane, Sep 05 2008 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 23 18:16 EDT 2024. Contains 371916 sequences. (Running on oeis4.)